Shock-loader.



lPATEN'IED JAN. 29, 1907.

0. E. NELSON.

SHOCK LQADER.

APPLIUTON FILED MAY 11, 1906.A

- s SHEETS-SHEET 1.

' INI/.ENTOK @aE/Yaka@ 1 4: TTORNE Ys THE NoRRls PETERS cn., WASHINGTON, n. c.

No. 842,417. PATENTBD JAN. 29, 1907.

Y o. E. NELSON.

SHOCK LOADER. PPL-IOATION PIYLND MAY 11. 190e.

A 3 SHEETS-SHEET 2.

.50 76 7% y f f Zi-7 E. kil l u Y ATTORNEYS rHsNcmms Param.- co.. wAsHnvcfcN, n! c.

No. 842,417. PATNNTED JAN. 29, 1907.'

' o. E. NELSON.

SHOCK LOADER.

APPLICATION FILED MAY 11. 190e.

v3 SHEETS-SHEET 3.

WTNESSES: A -NVENTOR.

l I /l y g t By I I l a 'am A ATTORNEYS:

1HE Noxms PETERS co., wAsHmaraN. D. c.

UNITED sTATEs PATENT oEEIcE.

oLEjE. NELsoN,oF HERMAN, MINNESOTA.

SHOCK-LOADER. i

To al whom it may concern:

Be it known that I, OLE E. NELSON, a citizen of the United States, residing atHerman, in the county of Grant and State of Minnesota,

have 'invented a new and useful Shock-.

Loader, of which the following is a specificati'on.

This invention relates to machines comn monlyfdesignated as ,shock-loadersg and its object is to provide a machine of this character which is adapte'd to be drawn over a iield and which will automatically engage a shock, raise it above the machine, andr release it at o ne side of the machine, so that the shock willl fall .into a wagon or lother recepl tacle located at the side of the machine.

Another Objectis to provide novel mechl ani sm whereby the various movements of the machine can be produced at the proper intervalswithout requiring the attention of an operator.

A further object is to provide novel means whereby the shock-lifting mechanism can be raised, partly rotated, and subsequently returned to its original lowered position. A still further object isto provide a clutch of novel form actuated by the'load and by the raising mechanism for throwing one of the traction or power wheels into or out of operative relation with the lifting mechan- V ism.

With the above and other objects inview the invention consists of a frame supported by wheels'of any desiredform, and a clutch ofnovel form is mountedupon the machine for the purpose of throwing one of the wheels into or out ofoperativerelation with acrossbeam.

A mast is fulcrumejd between its ends upon a brace which is pivotally supported on a ro.-

actuated by the load when the mast is in lowered position for throwing the drum into operative relation `with the traction-wheel so as to cause the elevation of the mast and the Specification of Letters Patent. Application filed May 11, 1906. Serial No. 316,334. i

Patented Jan. 29,1907.,

load. Means are provided for automatically locking the load within the forks and for releasing it after the mast has been raised and partly rotated, and mechanism is also employedv which is adapted to operate upon the completion of theswinging ofthe mast for releasing the drum, so as to permit the mast to return to its lowered position.

The invention also y consists yof certain other novel features of construction'and combinations of parts, which will be hereinafter more fully described, and pointed out in the claims. l f

In the aceompanyng drawings is shown the preferred form of the invention.

In-said drawings, Figure 1 is a plan view of. the complete machine, showing the mast in its normal or lowered position. Fig. 2 is a view, partly in side elevation and partly in section,'showing the mast raised and turned into position for discharging theload therefrom. Fig. 3 is a view, partly in section and partly in elevation, showing the upper' portion of the, mast and the position'assumed by the forks immediately subsequent to the discharge of the load. Fig. 4 is a similar view showing the forkslowered and in the positions assumed by them while gripping a shock. Fig. 5'is" an enlar ed yvertical section through a portion of t e frame and the lower part of the mast and brace f and showing the means for locking the holding-table of the forks. Figf is a bottom view of a lportion of the frame fand showing the mechanism for Atransmitting movement from the mast or kfork and to the clutch; and Fig. 7 is aview, partly in elevation and partly in section, of the drum and the mechanism for placing vit in engagement with the axle. i

Referringto the figures byeharacters of reference, A is a framer consisting of sideA beams l, connected at their forward ends by a rear beam 2, while a cross-beam 3 connects said side beams adjacentv their front ends 'n vand has centering or guide'blocks 4 dis osed thereon for the purpose'hereinafterset orth.' A platform 5 is carriedy by the centralportions of the side beams, and a longitudinallyextending supporting-strip 6 `extends from the platform to the rear beam. y Centering-` bloc s 7 are arrange'dupon one edge ofthe ICO.

los,

platform, and one of lthese blockst carries a f vertically-adjustable roller 8.

Rotatably mounted within and supporting the side beams'l is an axle 9, LhavlngtraelIO.V

and provided adjacent their heads `with iin'-A oers 16, extending` through openings 17 in one face of the drum. These fingers are contacted by springs 18, which force the dogs normally into contact with the toothed periphery of the disk, so that under ordinary conditions the drum will rotate with the disk and axle when the machine-is moved in one direction, but will not rotate therewith when the movement of the machine is reversed. Slotted ears 19 extend from the inner face of the drum, and mounted within them are pluirers 20, which bear at one end against the fingers 16, while their other ents are pivotallyl connected to a sleeve 21, slidably mounted on the axle 9 and. contacted by a lever 22, which is pivoted on the cross-beam 3 and loosely surrounds and is supported by the axle 9.

A vertical shaft 23 is rotatably mounted on the platform 5 and has a crank 24 at its upper end and another crank 25 at its other end. Crank 25 projects into a plate 26, in which is slidably mounted a rod 27, having a head 28, which slides within the plate 26. A coiled spring 29 is interposed between said head and one end of the plate for the purpose of holding the rod normally retracted into the plate 26. Rod 27 is pivoted to one end of a centrally-fulcrumed lever 30,.arranged -upon the bottom ofthe platform, and the same end ofthe lever is connected, by means of a link 31, with the lever 22, hereinbefore referred to. A plunger 32 is slidably supported by the cross-beam 3 and is connected to the other end of lever 30, and this plunger has a head 33 at its front end, which projects beyond the cross-beam 3. A suitable stop 34is secured upon the bottom of the platform for limitingA the movement .of lever 30 in one direction.

It is to be understood that the lever 30 is normally in position against the stop 34, and when so disposed a link 31 holds the lever 32 against the sleeve 21, and the plungers 2O are thus pressed against the fingers 16 and hold the dogs 14 out of engagement with teeth 12 while the springs 18 are tensioned. The

head 33 is also normally projected beyond the cross-beam 3. The drum is therefore normally disengaged from the toothed disk 11, and it is possible for the wheels 1() and axle 9 to rotate without actuating anyof-the mechanism.

Parallel superposed rails 35 are disposedl longitudinally on the strip 6 and are held spaced apart in any suitable manner, as by means of spacing-strips 36, disposed along the longitudinal centers vof the rails. The

rear ends of the rails are curved upward above the rear beam 2, as shown at 37, while the forward ends thereof after leaving the strip 6 are curved toward one of the side beams 1, as shown at 38, and terminate adj acent the ends of acurved guide-rail 39, which, with the curved portion 38 of the rails, forms substantially a circle about a pivot-bolt 40. On this bolt is mounted a table 41, having rollers 42 at one end which are mounted to travel within the curved guide-rail 39, and a raised angular tongue 43 extends from the opposite portion of the table and is connected to the rear beam 2 by means of an elongated coiled spring 44. This spring serves to hold the tongue normally projected toward the longitudinal strip 6.

Arranged upon the table 41 near one edge are upstanding ears 45, to the two end ones of which are pivoted the side beams 46 of a brace B. -These beams converge toward their upper ends, and said ends have means for engaging a pivot-bolt 47. bracket 48 is carried by the brace-.beam and has a pulley 49 journaled within it.. Pro- A grooved jecting between the` periphery of this pulley and the inner face of the bracket 48 is a wedge50, pivoted to one end of a rod 51, which in turn is pivoted to a lever 52, fulcrumed betweenits ends to intermediate ears 45 on the table. The lower end of this lever projects below the table and into the path of a cam 53, arranged on theplatform and adapted when the table is turned to a predetermined point to swing the lever 52 on its fulcrum and pull downward on rod 51 and wedge 50, thereby withdrawind'the wedge from position between the pu bracket. l

The brace B carries a mast C, formed of side beams 54, which converge rearwardly ICO` ley and its i and are spaced apart at desired intervals by y cross-strips 54. Ears 55 extend from the side beams adjacent the reduced end of the mast and `are pivoted on the bolt 47. The mast carries a truss 56 for reinforcing it longitudinally, and a cap 57 is Secured upon the reduced end or apex of the mast and is con-- nected,by means of a coiledspring 58, with a bracket 59 upon the mast C. This spring is adapted to draw the apex` of the mast toward the brace and to facilitate the raising of a load. A yoke 60 is swiveled to the cap 57 Y and carries rollers 61,.which are mounted to travel between the superposed rails 35, said rollers having Hanges 62 to prevent lateral displacement thereof. A pulley 63 is mounted within the mast adjacent its apex. An

arm 64 extends downward from one of the cross-strips 54 of the mast C and is adapted when they mast is in lowered position to bear upon the rod 51 adjacent its point of connection with lever 52, so that said lever will be projected into the path of the cam 53 whenever the mast is brought into lowered posi- IIO pulley 49 and bracket 48.` A guide-bracket 65 is fastened to the end cross-strip of the mast, and apulley 66 is disposed adjacent thereto.

Straps 67 extend from the ends of the beams 54 and, constitute supports for arod 68, which serves to connect said straps with ears 69, extending from the head. 70 of a rocking fork member D. This member consists of parallel curved arms 71., extending from the head 70 and suitably connected by means of cross-braces 7 2, and a pivot-rod 7 3 is also mounted within these arms and constitutes a support for apresser-plate 74, which is hung from the rod and is held normally pro.h jected.' beyond the head. 70 by means of a spring 75. The outward movement of this plate is limited by an angular arm 76,`which overlaps the head 70, and a plunger 77 is connected. to the lower` portion of the p .late and is slidably mounted. in the guide-brackets 65. A yoke 78 extends from under the head. 70 and has outstanding h ooks 7 9, rigidly secured. to it. A bail 80 is pivoted to the presser-plate 74. and is proportioned tol swing over the hooks 79 and to engage them for the purpose of holding the arms 71 and the head 70 at a predetermined angle to the mast. Another ail 81 is pivotally mountedon-the rod 68 and extends to the other side of yoke 78. A cable or rod 82 is secured at one end to the upper or forward cross-strip 54 ofthe mast and is permanently fastened to the lower bail 81, from which it extends through the yoke 78 and is permanently fastened to the other bail 80.

From the bail 80 the rope extends between the arms 71 and is fastened to a bail 83, extending upward from the head 84 of an outer fork member E. This head has bowed tines v85 extending from itand suitably braced and adapted to project between curved tines 86, extending from the head 7 0 0f fork member D. From the foregoing it will be obvious that when the bail 8O is disengaged .from the hooks 79 the rope 82 will limit the inward movement of the fork member E and the two members D and E will be spaced apart a proper distance.

A cable 87 is fastened to the yoke 78 and extends underpulley 66 and thence longitudinally of the stem and. partly around the pul# ley 63 and thence around pulley '49 and through bracket 48, the end of the .cable being permanently secured in any suitable manner to the mast, preferably adjacent pulley 63. Another eable'88 is fastened to one side of the cap 57 and is secured vat its other end to the drum 13. A pulley 89 is vsupportedbya bracket 9() near the upstandmg portions 37 of the rails 35 and extends above the path of this cable 88 when the mast is in its lowered position.

As heretofore stated, the mast lC is normally lowered, so as to rest on the cross-beam 3, and when it is in this position the yoke 60 and the rollers thereon rest between the upper end of the upstanding portion A37 of the rails 35. The cable 88 also extends down ward from the apex of the mast and under. the pulley 89 and thence around the roller 8 on centering-block 7 and under a guidepulley 91 at the side of the machine to the drum 13. The head 70 vof fork meinberD. rests on brackets 92, movablv connected to the forward ends of the beamsl and supported from arms 93 lof stems 94, which are slidably mounted within the arms and are surrounded by springs 95, which. bearat their ends on the arms 93 and upon .heads 96 at the ends of the stems. These springs 95 .constitute cushions for preventing injury to the mast and fork members when said parts drop to their lowered positions.` It is also to be understood. that when the mast is lowered the bail 80, is in engagement with the hooks 79, and the outer fork member E is therefore held projected beyond the member D by the rope 82. The yoke 78 of the fork member D 1s held substantially parallel with the mast by the rope or cable 87, which isheld taut y when the mast is in lowered position. The cable 87 is locked in taut position by reason of the fact that when the mast is lowered the arm 64 strikes the rod 51 and moves it into aline/ment with lever 52, thereby directing the wedge 50 between pulley 49 and bracket 48y and binding the cable 88 so as to prevent it from moving longitudinally The yoke 78 is therefore maintained substantially parallel with the mast. The plunger 7 7' registers with the head 33 of plunger), and this plunger and head remain in thisposition as long as the mast is lowered. Whilethe parts are in this position the machine is in condition for use. y

When it is desired` to load shocks onto a wagon, the same is connected inany desired manner' to one side of the machine,so as to assume a position substantially such as shown by dotted lines at97 in Fig. l. The-wagon and the machine therefore travel together, the fork members being arranged at the front of the machine. The wheels 10 and their axle 9 will revolve andthe mechanism will be unaffected thereby.- When' a shock is reached, the material will be gathered on thetines 86 of the' fork member D, and said. material will press backward on the plate 74, thereby causing the upper bail 8O to move `back out of engagement with thehooks 7 9;

The rope 82 will thereforebe released and the outer fork member E willdrop by gravity, so as to confine the material between the tines 85 and 86. Simultaneously' with the release of the bail 80V the plunger 77 presses backward on the head 33 of plunger 32, a

and as a result'of this operation the lever 30 is swung onit's fulcrum, so as to cause the -which travel in the guide-rail 39.

link 31 to pull on the lever 32. rlhe tensioned springs 18 will therefore press the do s 14 into engagement with the teeth on dis k11, and these springs 18 will also be of sufficient strength to swing the plungers 2O toward each other and slide the sleeve 21 longitudinally on the axle and against the lever 22. The drum is thus locked into engagement with the disk, and during the continued movement of the machine said drum will be caused to rotate with the disk and axle. Cable 88 will therefore be slowly wound on the drum, and as this cable extends under pulley 89 the apex or capped end of the mast will be pulled downward upon the upstanding portions 37 of rails 35 until said cable passes the pulley 89, which action is per lnitted in view of the fact that the connection between the cable and cap is capable of riding under the pulley. As soon as the rollers 61 have completed their downward movement upon the upstanding portions 37 of the rail the continued winding of the cable 88 will draw the rollers along the longitudinally-extending portions of the rails, thereby causing the fork-carrying end of the mast to swing upward and also causing the brace B to swing upon its pivotal connection with the table 41. Up to this point the raising of the mast has been facilitated by spring 58, which is tensioned while themast is in lowered position and naturally contracts while the mast is being raised. When the rollercarrying yoke reaches the forward end of the longitudinal portion of the tracks, the brace B assumes such a 'position that the lower end of lever 52 projects below the table and into the path of the rcam 53. Further rotation of the drum and corresponding winding of the cable 88 will now swing the yoke 6() and its rollers 61 onto the curved portion 38 of the rails and will cause the table 41 to swing on its pivot, this movement being facilitated because of the rollers 42, Just prior to the completion of this swinging movement of the table the lever 52 strikes the cam 53 and breaks the joint between said lever and rod 51, so as to cause `the withdrawal of the wedge from engagement with the cable 87, and therefore said cable will be chine.

vpromptly released and the weight of the material carried by the fork members will cause the tines 86 to swing downward and the hook 7 9 on yoke 78 to swing upward into engagement with the upper bail 80. rl`he rope 82 will therefore pull on the bail 83 and cause the shaft will be sufficient to swing the lower crank 25 so as to pull on the rod 27 and tensioned by the rotation of the table 41, will therefore promptly return the table to its initial position. As soon asthe yoke 60 arrives in 'position at the forward end of the longitudinal portion of rails 35 the upper end of the mast and the fork members carried thereby will swing downward by gravity, causing the rollers 61 to travel along the rails and into the upstanding portions 37 thereof, whereupon all of the parts will return to their initial position and the operation can be repeated in the manner described. A' As the mast swings downward the cable 87 is pulled longitudinally7 so as to swing the fork members upward into osition to receive shocks between them, an just as the mast reaches the limit of its movement the arm 64 strikes the rod 51 and throws the wedge 50 against the cable 87, so as to lock it until after said cable has been released by the cam 53 in the manner heretofore described.

It will be seen that this machine can be drawn forward uninterruptedly and will automatically operate to grip, raise, and discharge shocks and will automatically reset itself to repeat this operation,'the hoisting by the mechanism being in every instance started by the pressure of material accumulated'by the forks. l

The preferred form of the invention has been set forth in the foregoing description; but I do not limit myself thereto, as I am aware that modifications may be made therein without departing from the spirit or sacrificing the advantages thereof, and l therefore reserve the right to makel such changes as fairly fall within the scope of the invention.

What is claimed is 1. In a machine of the character described the combination with a frame, and wheels supporting the same of a shock-engaging device carried by the frame, mechanism operated by the movement of the frame for raising the shock-engaging device, and means operated by the impact of said device against a shock for moving said mechanism into operative relation with the wheels.

2. In a machine of the character described the combination with a frame, and supporting wheels therefor; of hoisting mechanism carried by the frame, -a shock-grabbing device connected to said mechanism, and means op- IOO IIO

erated by the impact of a shock with said grabbingmeans for throwing the hoisting mechanism into operative relation withthe wheels. n

3. In a machine of the character ydescribed the combination with a frame, and supporting-wheels therefor; of a mast ymovably supported by the frame, mechanism for hoisting the mast, shock-engaging means carried by the mast, and means operated by the contact of a shock with the engaging means for throwing the hoisting mechanism into operative relation with the wheels.

4. -In a machine ofthe character described the combination with a frame, and. supporting-.wheels therefor; of a mast carried by the l frame, mechanism'for successively swinging the mast vertically and laterally, a shockgrabbing device carriedv by the mast, and means o erated by the contact of a shock with saiddevicefor throwing the mast-operating mechanism into operative relation with the wheels.

5. Ina machine of the character described the combination with a frame, and supporting-wheels therefor; of a mast carried bythe frame, mechanism for successively swinging the mast vertically and laterally, a shock-engaging device carried by the mast, meansgoperated bythe contact kof a shock withlsaid device for throwing the mast-operating mechanism .into operative relation with the wheels, and means operated by the lateral swinging of the mast for releasing the mast-operating mechanism. 1 f- `6. In a machine ofthe character described the combination with a frame, and supporting-'wheels therefor of a mast carried by the frame, mechanism for successively swinging the mastv vertically and laterally, 'a shockgrabbing device carried by the mast, means operated by the contact of ashock with said' device for throwing the mast operating mechanism into operative relation with the wheels, and means for returning the mast to its lowered position subsequent to the release of said mechanism.

7. .In a machine of the character described the combination with a Jframe, and su porting-wheels therefor; of a mast movabllycarried by the frame, a rotatable drum, means operated by the drum for swinging the mast vertically and laterally successively, a shockgrabbingdevice carried by the mast, and means operated bythe contact of a shock lwith said device for placing the drum in operative relation lwithv the supporting-wheels. S. In a machine of the character described the ycombination with a frame, and supporting-wheels therefor; of a mast movably mounted on the frame, aV drum, Aa clutch for `placing the drum into or out of operative relation with the Lsupporting-wheels, mechanism operated by the rotation of the drum for successively swinging the mastvertically and laterally, a shock-grabbing device upon i the mast, and means operated by the contact cfa shock with said device for actuating' the clutch to place thedrum in operative relation with the wheels. l i, t

9. In a machine of the character described the combination with a frame, and wheels supporting the same; of. a brace pivotally supported by the frame, a mast iulcrumed between its ends upon .the brace, a guide for one end of the mast and means for actuating it'within its guide to'raise the brace and mast.

10. In a machine of the character `described they combination with a frame, and a rotatable-y element connected thereto; of a brace pivoted upon the frame, a mast fulcrumed between its ends upon the brace, guides carried by the frame and movably engaged by one end of the mast, and means operated by the revolution of the rotatable element for'moving the mast within the brace to swing said mast and brace vertically.

l1. In a machine yof the character described the combination with a tramaand a rotatablel element connected thereto; of a brace pivoted upon the frame, a mast fulcrumed between its ends upon the brace,'

carried by the frame and partly surrounding the table, means upon the mast for movably engaging the rails, and mechanism operated by the rotatable element for moving the railengaging means upon the rails to swing the ymlast vertically and the table and -mast lateral y. '13. In a ,machine of the character described the combination with-a frame', and a rotatable element; of atablecarried by and adapted to partly rotate on the frame, a: brace pivotally connected to the table and movable therewith, a mast ulcrumed between its ends upon the brace, Aguide-rails carried by the frame and partly surrounding kthe table, means upon the mast for movably engaging the rails, mechanism operated yby the rotatable element for moving the rail-en- IOO gaging means upon the-rails to swing the mast vertically and the table and mast laterally, and a spring connectionbetween the mast and .brace to facilitate the vertical swinging of the mast. 14.-. Ina machine of the character described the combination with-a frame and a rotatable element; of atable carried by and adapted to partly rotate on the frame, a brace pivotally connected to the table and movable therewith, a mast fulcru'med between its ends upon the brace, guide-rails ally, and elastic means for retarding the lateral movement of the mast and table.

15. In a machine of the character described the combination with a frame, and a rotatable element; of a table carried by and adapted to partly rotate on the frame, a brace pivotally connected to the table and movable therewith, a mast fulcrumed between its ends upon the brace, guide-rails carried by the frame and partly'surrounding the table, means upon the mast for movably engaging the rails, mechanism operated by the rotatable element for movingthe rail-engaging means upon the rails -to swing the mast vertically and the table and mast laterally, and means operated by the partial rotation of the table for throwing the mast-operating mechanism out of operative relation with therotatable element.

16. In a machine of the character described the combination with a frame having` a rotatable element; ol` longitudinally-extending guide-rails carried by the frame and having upstanding portions at one end, and laterally-curved portions at the other end, a table mounted to partly rotate upon the frame adjacent the laterally-curved portions of the rails, a brace pivotally mounted upon the table,-a mast fulcrumed between its ends to the brace, means upon one end of the mast for traveling .between all portions of the guide-rails, and means operated by the rotatable element for moving the rail-engaging means longitudinally of the rails to successively swing the mast vertically and, with .j the table, laterally.

17. In a machine of the 4character described the combination with a frame having a rotatable element; of longitudinally-extending guide-rails carried by the frame and having upstanding portions at one end, and laterally-curved portions at the other end, -a table mounted to partly rotate upon the frame adjacent the laterally-curved portions of the rails, a brace pivotallymounted upon the table, amast fulcrumed between its ends on the brace, means upon one end of the mast for traveling between all portions of the guide-rails, and means operated by the rotatable element for Vmoving the rail-engaging means longitudinally ofthe rails to successively swing the mast vertically and, with the table, laterally, and means operated by the pivotal movement of the table in one di- '18. In a machine of the character described the combination with a frame, and a rotatable element; of a toothed disk movable with said element, a drum inclosing the disk loosely mounted on the element, means carrieil by the drum Jfor engaging the disk, a vertically movable mast carried by the frame, mean'sfoperated by the drum for raising the mast, and means operated by the mast at the completion of its movement for disengaging the disk from the drum.

19. In a machine of the character described the combination .with a frame, and supporting wheels therefor; of a toothed disk rotatable with the wheels, a drum mounted adjacent the disk, means carried by the drum for engaging the disk, a mast movably mounted on the frame, means operated by the drum for successively swinging the mast vertically and laterally, and means operated by the lateral movement of the mast for releasing the drum from the disk.

20. In a machine of the character described the combination with a frame, and wheels for supporting the frame; of a disk rotatable with said wheels, a drum, means carried by the drum for engaging the disk, a mast movably mounted upon the frame, means operated by the drum for successively swinging the mast'vertically and laterally, a shock-grabbing device carried by the mast, and means operated by the contact of a shock with said device Jfor placing the drum in operativerelation with the disk.

21. In a machine of the character described tlie combination with a frame, and wheels for supporting the same of a mast movably mounted upon the frame, mechanism for swinging the mast-vertically, fork members carried by the mast and movably connected, and means connecting said members and the mast for automatically spreading the members apart under the weight of a load therein.

22. In a machine of the character described the combination with a frame, a brace pivotally mounted thereon, and a mast ul'crumed between its ends upon the brace;

of ,mechanism for swinging the mast and brace vertically, a rocking fork member connected to the mast, an outer fork member movably connected to the rocking fork member, means operated by a load on the members for automatically spreading them apart, and la lock for securing the members in eX- tended position. A

23. In a machine of the character described the combination with'a frame, and supporting-wheels therefor; of a brace pivoted to the frame, a mast vlulcrumed between its ends to the brace, mechanism for swinging the brace and mast vertically, pivotally- IIO fork member movably connected to ther mast, a yoke outstandingtherefrom, a flexi ble connection between the yoke, mast, and brace, said connection adapted to swing the -yoke against the mast when the mast is lowered, and means operated 'by the lowering of the mast for clamping said connection against movement. l

25. In a machine of the character described the combination with a table adapted to partly rotate, a brace pivoted upon the v table, and a mast iulcrumed upon the brace;

of mechanism for successively swinging the brace and mast vertically and laterally, a fork member movably connected to the mast, an outstanding yoke thereon, a flexible connection between the yoke and mast, means on the brace for engaging said connection to render it taut when the mast is lowered,

means operated by the lowering of the mast for securing the rope when taut, and means operated by the lateral movementghofgi the raised mast and brace for releasing 'the taut connection. y

26. In a machine of the character described the combination with a frame, and wheels supporting the same of a mast movably mounted on the frame, vmechanism for raising the mast, shock-grabbing devices connected to the mast, means carried by the mast for securing said devices in extended position, and means actuated by thev pressure of the shock upon one ofthe devices for releasing said devices to grip the shock:

27. In a machine of the character de-v o scribed the combination with a vertically-- movable mast, and mechanism for actuating e the same of a rocking Jfork member conf nected to the mast, a hooked yoke outstanding therefrom, an outwardly-extending fork member connected to the rocking fork inember, means connected thereto and engaging the hooked yoke for securlng the members in extended position, and means operated by the pressure of a shock against' the rocking member for releasing the outwardly-extending member to embrace the shock.

In testimony that I claim the foregoing as my own I have hereto aflixed my signature l in the presence of two witnesses.

o OLE E. NELSON.

Witnesses: i l

H. SAMPsoN, R. SOLBERG. 

